Shut down K-Meleon and extract the folders in the respective locations.
Before replacing the files in order to avoid any inconveniences rename:
privbar_green.bmp to privbar_green.bmp.old (located in your Klassic folder)
privbar_red.bmp to privbar_red.bmp.old (located in your Klassic folder)
toolbars.cfg to toolbars.cfg.old (located in your Klassic folder)
main.kmm to main.kmm.old (located in your macros folder)